def is_prime(n):
    if n<2:
        return False
    for i in range(2,int(n**0.5)+1):
        if n%i==0:
            return False
    return True

print(is_prime(13))



def test_one():
    number = 10    	              # 局部变量
    print(number) 	              # 函数内部访问局部变量
test_one()
 #print(number)


def test_one():
    number = 10
    print(number)             # 访问test_one()函数的局部变量number
def test_two():
    number = 20
    print(number)             # 访问test_two()函数的局部变量number
test_one()
test_two()

#全局变量
